MySql嵌套存储过程调用

我在MySQL中有2个存储过程。我想打电话从另一个但我需要一些帮助，语法MySql嵌套存储过程调用

下面是步骤1 FindPreviousDate

DELIMITER $$ CREATE PROCEDURE `FindPreviousDate`(IN eventdate DATETIME, IN lookbackDays INT, IN symbol VARCHAR(20)) 
BEGIN 
SELECT * 
FROM Price a 
WHERE a.eventDate between (eventDate - interval lookbackDays day) and (eventdate - interval 1 day) and a.symbol = symbol 
ORDER BY a.eventDate DESC 
LIMIT 1; 
END

下面是步骤2 FindCloseEvent

CREATE PROCEDURE `FindCloseEvent`(IN startdate DATETIME, IN enddate DATETIME,IN symbol VARCHAR(20), IN cutoff DOUBLE) 
BEGIN 
SELECT * 
FROM Price a 
WHERE a.eventDate between startdate and enddate and 
(SELECT COUNT(*) from Price b where b.eventDate = a.eventDate and b.closePrice < cutoff and a.symbol = b.symbol and 
(SELECT COUNT(*) from Price c where c.eventDate = (b.eventDate - interval 1 day) and c.closePrice >= cutoff and b.symbol = c.symbol)); 
END

我想将这段代码在程序2中使用程序1的结果